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JackSepticeye was born Seán William McLoughlin in Ireland in February 1990. Before his YouTube career, he played drums in some band. He joined YouTube in 2007, but didn't really start posting until 2013. At first, he didn't have many subscribers and was almost sane. Then something horrible happened. PewDiePie, the most subscribed person on YouTube mentioned him and he became popular as hell, getting more subscribers all the time while quickly losing his sanity.

jacksepticeye got this name because his friend found out that his mother called jack then his friend called him jack then he was playing soccer and he was in goal and some lad tried to header the ball and got him e got a massive cut and i got all infected thats how he got his name

His fanbase mostly consists of 12 year olds, millions of which came from PewDiePie's and Markiplier's channels. Unsurprisingly, three of his most viewed videos are Five Nights at Freddy's videos, indicating that almost all of his viewers are underage/immature FNaF fanboys who don't care about his other content and constantly terrorize his channel comments, demanding him to "DO MOAR FNAF VIDS!!!!!!11".